Supporting Information

The volumetric value for the line item for the 2010–11 year was 20,588 ML. The line item represents non-allocated diversions for urban water systems in the Murray–Darling Basin (MDB) region. Non-allocated diversions are made under water access entitlements, for which no present commitment (water liability) to deliver water to users was recognised.

The following tables provide information for the line item in the MDB region on sustainable diversion limit (SDL) area basis.

Summary of non-allocated diversions for urban water systems in the MDB region in the 2010–11 year

Surface water resource plan area

State

Volume (ML)

Code

Name

SW19

Warrego – Paroo – Nebine

Qld

44

SW18

Condamine–Balonne

Qld

2,344

SW17

Moonie

Qld

2

SW16

Qld Border Rivers

Qld

777

SW15

NSW Border Rivers

NSW

–

SW11

Barwon–Darling watercourse

NSW

–

SW12

NSW Intersecting Streams

NSW

–

SW14

Gwydir

NSW

na

SW13

Namoi

NSW

na

SW10

Macquarie–Castlereagh

NSW

na

Sub-total Northern Basin

3,167

SW9

Lachlan

NSW

na

SW8

Murrumbidgee NSW

NSW

na

SW7

NSW Murray and Lower Darling

NSW

na

SW3

Northern Victoria

Vic

16,734

SW2

Vic Murray

Vic

687

SW4

Wimmera–Mallee

Vic

na

SW6

Eastern Mount Lofty Ranges

SA

–

SW5

SA Murray

SA

–

SW1

ACT

ACT

na

Sub-total Southern Basin

17,421

Total for the region

20,588

– = Data not available, na = not applicable

Details of non-allocated diversions for urban water systems in the MDB region in the 2010–11 year

Surface water resource plan area

SDL area

State

Volume (ML)

Code

Name

Warrego – Paroo – Nebine

SS29

Paroo

Qld

44

SS28

Warrego

Qld

0

SS27

Nebine

Qld

0

Condamine–Balonne

SS26

Condamine–Balonne

Qld

2,344

Moonie

SS25

Moonie

Qld

2

Qld Border Rivers

SS24

Qld Border Rivers

Qld

777

Sub-total Northern Basin

3,167

Vic Murray

SS3

Kiewa

Vic

479

Northern Victoria

SS4

Ovens

Vic

1,513

SS6

Goulburn

Vic

13,485

SS7

Campaspe

Vic

175

SS8

Loddon

Vic

1,561

Vic Murray

SS2

Vic Murray

Vic

208

Sub-total Southern Basin

17,421

Total for the region

20,588

Further information for Queensland

Queensland volumes in the previous table were diverted under the unsupplemented entitlement class, in which the purpose of the diversion was known as urban. All unsupplemented diversions for which the purpose was not distinguished (may include urban diversions) in Queensland have been included in volumes shown under line item 17.7 Non-allocated diversions to users.

Further information for New South Wales

In New South Wales, no separate information was available in the unregulated system for urban purposes and therefore, all unregulated diversions are shown under line item 17.7 Non-allocated diversions to users.

Further information for Victoria

Victorian volume for the Goulburn SDL area includes 11,287 ML that was transferred from the Wallaby and Silver creeks to Melbourne.

Quantification Approach

Data Source

Water audit monitoring (WAM) data received from Queensland (22 December 2011) and Victoria (31 January 2012), and stored in the Murray–Darling Basin Authority HYDRO database.

Provided by

Murray–Darling Basin Authority.

Method

Values are based on metered diversions and estimates. The estimates are based on user meter readings and user returns.

Assumptions, Limitations, Caveats and Approximations

Estimates of uncertainty of the diversions are indicative of the accuracy of bulk diversions at the abstraction point on the river only.

Uncertainty reported for diversion at the abstraction point accounts for possible errors in the data collection process.

A single metered abstraction point may provide water to a range of users under various types of entitlements (e.g. stock and domestic class). When this happens, the jurisdiction may split the metered abstraction into several classes of entitlements or types of users, according to priority rules governing the entitlements. This split has an inherent uncertainty that is not considered here.

Uncertainty Information

The following tables show the WAM uncertainty definitions and the measurement method applied that relates to the reported uncertainty percentage, and the WAM uncertainty percentage for each entitlement class for each jurisdiction.

Uncertainty definitions for WAM data

Uncertainty percentage

Accuracy Description

5

Metered diversions

10

Estimate based on user meter readings

20

Detailed estimate based on regional surveys

40

Estimate based on user returns

WAM uncertainty percentage for each entitlement class associated with non-allocated urban diversions for each jurisdiction

Jurisdiction

All entitlement classes in following SDL areas

WAM uncertainty (%)

Qld

Condamine–Balonne

5

Qld

Moonie System

5

Qld

Border Rivers

5

Vic

Ovens

18

Vic

Goulburn–Broke

5–10

Vic

Campaspe

40

Vic

Loddon

40

Vic

Murray

40

Comparative year

The value reported as comparative year corresponds to the line item stated in the following table that were reported in the 2010 Account.

Restatement of comparative year information made for the line item 17.8 Non-allocated diversions – urban water system